Have a tubo evic, lil bud classic, M, and mighty. Awaiting an Imp because of course. Had a Z but sold it to fund a mighty purchase. Liked the Z a lot but I had other things that filled that niche and I had some hotspot/charring. Havent tried the firewood, curious about the 6.
Fav is tubo, just so damn smooth, without any special mouthpiece. Never combusts or even approaches, I dont have hotspots, only starts to char a bit at 215 or more. Battery life is poor but I never need more than one battery for a session and battery is poor for all on-demand, just the nature of power required. Battery life was poor for Argo too and I always carried an extra. The 510s mitigate this somewhat with the choice of mods and extra batteries, but then you have to tweak the mod yourself and some require replacing coils. Tubo comes set to cloud city out the box.
LB Classic is outstanding, takes more technique but holds flavor really well and hits just as hard as any. Downside is power varies a bit based on battery power, if you arent mindful you can combust. It is my portable, fits in a pants pocket easy. Needs an external 18650 charger. Get the glass insert if you go this route. Both LB and tubo are super easy to clean cuz its just the mouthpiece collecting reclaim.
M is great for what it is. Torches mostly infuriate me.
Mighty is as great as everyone says, tied w tubo for me, but does take a minute to warm up and takes longer to extract roughly the same amount. And a flipping process to clean. Hope that helps in some way.